Hi jcs2000,
There aren’t a lot of great choices right in Jacksonville but post #7 here includes some of the better ones and I would personally take the drive to Holly Hill and visit Fox Mattress. They are members of this site … meaning I consider them to be among the best of the best in terms of quality, service, and value … and I think a visit to a knowledgeable manufacturer or outlet who is “on your side” can save a lot of frustration and even time in trying to sort through all the marketing stories only to find the information you really need to make meaningful comparisons isn’t available anyway.
Hope this helps.
Phoenix